A light bulb manufacturer guarantees the mean life of a light bulb is at least 731 hours. A random sample of 29 light bulbs has a mean life of 705 hours. Assume the population is normally distributed and the population standard deviation is 57 hours. a= 0.08. do you have enough evidence to reject the manufacturer's claim?

A light bulb manufacturer guarantees the mean life of a light bulb is at least 731 hours. A random sample of 29 light bulbs has a mean life of 705 hours. Assume the population is normally distributed and the population standard deviation is 57 hours. a= 0.08. do you have enough evidence to reject the manufacturer's claim?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 13PPS

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Question

A light bulb manufacturer guarantees the mean life of a light bulb is at least 731 hours. A random sample of 29 light bulbs has a mean life of 705 hours.

Assume the population is normally distributed and the population standard deviation is 57 hours.

a= 0.08.

do you have enough evidence to reject the manufacturer's claim?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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